Free Website Speed Test

Run a full Lighthouse-powered speed test on any URL. Get your performance score (0–100), measure LCP, CLS, INP, TTFB, and see a breakdown of what's slowing your page down — from oversized images to render-blocking scripts.

scheduleSpeed tests typically take 15–30 seconds.

What This Tool Checks

check_circleGoogle Lighthouse performance score (0–100) for mobile and desktop
check_circleCore Web Vitals: LCP (Largest Contentful Paint), CLS (Cumulative Layout Shift), INP (Interaction to Next Paint)
check_circleTTFB (Time to First Byte) — server response speed
check_circleFirst Contentful Paint (FCP) and Speed Index
check_circleRender-blocking resource detection
check_circleOpportunity list: specific improvements with estimated time savings

How to test your website speed

Run a Google Lighthouse audit on any URL and read the results in under 60 seconds.

1
Enter your URL
Paste the page URL you want to test into the input field above.
2
Click Test Speed
PerfBee runs a full Google Lighthouse audit on mobile and desktop.
3
Wait for results
Audits typically complete in 15–30 seconds depending on page size.
4
Review Core Web Vitals
Check your LCP, CLS, and INP scores against Google's thresholds (Good / Needs Improvement / Poor).
5
Apply the recommended fixes
Work through the prioritized opportunity list — each fix shows estimated time savings.

lightbulb

Why This Matters for SEO

Page speed is a confirmed Google ranking factor for both desktop and mobile searches. Google's Core Web Vitals — LCP, CLS, and INP — are measured at the 75th percentile of real user visits and directly influence where you rank. A 1-second improvement in load time can increase conversions by 7%, according to Google's research.

Want this audit running on every page of your site, every day? See PerfBee Performance Boost — Continuous Core Web Vitals monitoring with deploy comparisons and AI fix suggestions.

Frequently Asked Questions

How do I check my website speed?expand_more

Enter your URL above and click "Test Speed." Our tool runs a Google Lighthouse audit in seconds and returns your performance score (0–100), Core Web Vitals metrics, and a list of specific improvements with estimated time savings. You'll get both mobile and desktop scores.

What is a good website speed score?expand_more

Google Lighthouse scores pages from 0 to 100. A score of 90–100 is considered "Good," 50–89 is "Needs Improvement," and below 50 is "Poor." For Core Web Vitals specifically: LCP should be under 2.5 seconds, CLS under 0.1, and INP under 200ms. Most real-world sites score between 40–80 on mobile.

Why is my website slow?expand_more

Common causes of slow websites include: unoptimized images (the #1 cause), render-blocking JavaScript and CSS, no CDN (serving assets from a single server location), slow server response time (TTFB over 600ms), too many HTTP requests, no browser caching, and large JavaScript bundles. Our speed test identifies your specific bottlenecks and prioritizes them by impact.

Does page speed affect Google ranking?expand_more

Yes. Google uses Core Web Vitals (LCP, CLS, INP) as part of its Page Experience ranking signals. Pages that pass the "Good" threshold for all three Core Web Vitals may see a ranking advantage over competing pages with similar content quality. Google has confirmed this in their documentation on the Page Experience update.

What is the difference between mobile and desktop speed scores?expand_more

Lighthouse tests mobile using a simulated Moto G Power device on a throttled 4G connection (10 Mbps, 40ms RTT). Desktop tests use a faster, unthrottled connection. Most sites score 20–40 points higher on desktop. Because Google uses mobile-first indexing, your mobile score is the more important one for SEO.

rocket_launchFree forever plan — no credit card required

Track speed over time — not just once

PerfBee runs daily performance audits and tracks your Core Web Vitals history. Get AI fix suggestions and see what changed after every deploy. Get daily crawl reports, broken link alerts, Core Web Vitals tracking, and AI fix suggestions — across your entire site.